It looks like the Ubuntu version of zway I downloaded was for x86-64 platform. What version do I need to pick for arm64? (aarch64?)
I also checked the raspberry pi version and it is an arm32 (armhf) platform.

Unfortunately the raspberry pi version I downloaded shows up as arm32. (Raspberrypixtool) I used the Ubuntu version because my OS/kernel is Ubuntu/Debian based. Are there multiple version of the raspberry pi?

I figured it out by installing one by one each missing armhf (32bit) library on my arm64 Ubuntu. It was not too bad but I wish it was better documented. On arm platform (rasberry Pi) zway is only available on 32bit. This was on a pine64 with Armbian running on top of 64bit Ubuntu 18.04.

The libraries missing were libavahi-compatible-dnssd1, libssl, libarchive12, libc-ares-dev, libcurl3 and libcurl4 all needed with the :armhf appendix to get the 32bit version and obviously the 32bit platform had to be added to the 64bit OS.